arch/arm26/nwfpe/fpa11_cpdt.c - kernel/msm - Gitiles

 /*
     NetWinder Floating Point Emulator
     (c) Rebel.com, 1998-1999
     (c) Philip Blundell, 1998

     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

 #include "fpa11.h"
 #include "softfloat.h"
 #include "fpopcode.h"
 #include "fpmodule.h"
 #include "fpmodule.inl"

 #include <asm/uaccess.h>

 static inline
 void loadSingle(const unsigned int Fn,const unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    fpa11->fType[Fn] = typeSingle;
    get_user(fpa11->fpreg[Fn].fSingle, pMem);
 }

 static inline
 void loadDouble(const unsigned int Fn,const unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    unsigned int *p;
    p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
    fpa11->fType[Fn] = typeDouble;
    get_user(p[0], &pMem[1]);
    get_user(p[1], &pMem[0]); /* sign & exponent */
 }

 static inline
 void loadExtended(const unsigned int Fn,const unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    unsigned int *p;
    p = (unsigned int*)&fpa11->fpreg[Fn].fExtended;
    fpa11->fType[Fn] = typeExtended;
    get_user(p[0], &pMem[0]);  /* sign & exponent */
    get_user(p[1], &pMem[2]);  /* ls bits */
    get_user(p[2], &pMem[1]);  /* ms bits */
 }

 static inline
 void loadMultiple(const unsigned int Fn,const unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    register unsigned int *p;
    unsigned long x;

    p = (unsigned int*)&(fpa11->fpreg[Fn]);
    get_user(x, &pMem[0]);
    fpa11->fType[Fn] = (x >> 14) & 0x00000003;

    switch (fpa11->fType[Fn])
    {
       case typeSingle:
       case typeDouble:
       {
          get_user(p[0], &pMem[2]);  /* Single */
          get_user(p[1], &pMem[1]);  /* double msw */
          p[2] = 0;        /* empty */
       }
       break;

       case typeExtended:
       {
          get_user(p[1], &pMem[2]);
          get_user(p[2], &pMem[1]);  /* msw */
          p[0] = (x & 0x80003fff);
       }
       break;
    }
 }

 static inline
 void storeSingle(const unsigned int Fn,unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    union
    {
      float32 f;
      unsigned int i[1];
    } val;

    switch (fpa11->fType[Fn])
    {
       case typeDouble:
          val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
       break;

       case typeExtended:
          val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
       break;

       default: val.f = fpa11->fpreg[Fn].fSingle;
    }

    put_user(val.i[0], pMem);
 }

 static inline
 void storeDouble(const unsigned int Fn,unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    union
    {
      float64 f;
      unsigned int i[2];
    } val;

    switch (fpa11->fType[Fn])
    {
       case typeSingle:
          val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
       break;

       case typeExtended:
          val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
       break;

       default: val.f = fpa11->fpreg[Fn].fDouble;
    }

    put_user(val.i[1], &pMem[0]);	/* msw */
    put_user(val.i[0], &pMem[1]);	/* lsw */
 }

 static inline
 void storeExtended(const unsigned int Fn,unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    union
    {
      floatx80 f;
      unsigned int i[3];
    } val;

    switch (fpa11->fType[Fn])
    {
       case typeSingle:
          val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
       break;

       case typeDouble:
          val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
       break;

       default: val.f = fpa11->fpreg[Fn].fExtended;
    }

    put_user(val.i[0], &pMem[0]); /* sign & exp */
    put_user(val.i[1], &pMem[2]);
    put_user(val.i[2], &pMem[1]); /* msw */
 }

 static inline
 void storeMultiple(const unsigned int Fn,unsigned int *pMem)
 {
    FPA11 *fpa11 = GET_FPA11();
    register unsigned int nType, *p;

    p = (unsigned int*)&(fpa11->fpreg[Fn]);
    nType = fpa11->fType[Fn];

    switch (nType)
    {
       case typeSingle:
       case typeDouble:
       {
 	 put_user(p[0], &pMem[2]); /* single */
 	 put_user(p[1], &pMem[1]); /* double msw */
 	 put_user(nType << 14, &pMem[0]);
       }
       break;

       case typeExtended:
       {
 	 put_user(p[2], &pMem[1]); /* msw */
 	 put_user(p[1], &pMem[2]);
 	 put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
       }
       break;
    }
 }

 unsigned int PerformLDF(const unsigned int opcode)
 {
    unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
      write_back = WRITE_BACK(opcode);

    //printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));

    pBase = (unsigned int*)readRegister(getRn(opcode));
    if (REG_PC == getRn(opcode))
    {
      pBase += 2;
      write_back = 0;
    }

    pFinal = pBase;
    if (BIT_UP_SET(opcode))
      pFinal += getOffset(opcode);
    else
      pFinal -= getOffset(opcode);

    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

    switch (opcode & MASK_TRANSFER_LENGTH)
    {
       case TRANSFER_SINGLE  : loadSingle(getFd(opcode),pAddress);   break;
       case TRANSFER_DOUBLE  : loadDouble(getFd(opcode),pAddress);   break;
       case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
       default: nRc = 0;
    }

    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
    return nRc;
 }

 unsigned int PerformSTF(const unsigned int opcode)
 {
    unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
      write_back = WRITE_BACK(opcode);

    //printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
    SetRoundingMode(ROUND_TO_NEAREST);

    pBase = (unsigned int*)readRegister(getRn(opcode));
    if (REG_PC == getRn(opcode))
    {
      pBase += 2;
      write_back = 0;
    }

    pFinal = pBase;
    if (BIT_UP_SET(opcode))
      pFinal += getOffset(opcode);
    else
      pFinal -= getOffset(opcode);

    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

    switch (opcode & MASK_TRANSFER_LENGTH)
    {
       case TRANSFER_SINGLE  : storeSingle(getFd(opcode),pAddress);   break;
       case TRANSFER_DOUBLE  : storeDouble(getFd(opcode),pAddress);   break;
       case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
       default: nRc = 0;
    }

    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
    return nRc;
 }

 unsigned int PerformLFM(const unsigned int opcode)
 {
    unsigned int i, Fd, *pBase, *pAddress, *pFinal,
      write_back = WRITE_BACK(opcode);

    pBase = (unsigned int*)readRegister(getRn(opcode));
    if (REG_PC == getRn(opcode))
    {
      pBase += 2;
      write_back = 0;
    }

    pFinal = pBase;
    if (BIT_UP_SET(opcode))
      pFinal += getOffset(opcode);
    else
      pFinal -= getOffset(opcode);

    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

    Fd = getFd(opcode);
    for (i=getRegisterCount(opcode);i>0;i--)
    {
      loadMultiple(Fd,pAddress);
      pAddress += 3; Fd++;
      if (Fd == 8) Fd = 0;
    }

    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
    return 1;
 }

 unsigned int PerformSFM(const unsigned int opcode)
 {
    unsigned int i, Fd, *pBase, *pAddress, *pFinal,
      write_back = WRITE_BACK(opcode);

    pBase = (unsigned int*)readRegister(getRn(opcode));
    if (REG_PC == getRn(opcode))
    {
      pBase += 2;
      write_back = 0;
    }

    pFinal = pBase;
    if (BIT_UP_SET(opcode))
      pFinal += getOffset(opcode);
    else
      pFinal -= getOffset(opcode);

    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

    Fd = getFd(opcode);
    for (i=getRegisterCount(opcode);i>0;i--)
    {
      storeMultiple(Fd,pAddress);
      pAddress += 3; Fd++;
      if (Fd == 8) Fd = 0;
    }

    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
    return 1;
 }

 #if 1
 unsigned int EmulateCPDT(const unsigned int opcode)
 {
   unsigned int nRc = 0;

   //printk("EmulateCPDT(0x%08x)\n",opcode);

   if (LDF_OP(opcode))
   {
     nRc = PerformLDF(opcode);
   }
   else if (LFM_OP(opcode))
   {
     nRc = PerformLFM(opcode);
   }
   else if (STF_OP(opcode))
   {
     nRc = PerformSTF(opcode);
   }
   else if (SFM_OP(opcode))
   {
     nRc = PerformSFM(opcode);
   }
   else
   {
     nRc = 0;
   }

   return nRc;
 }
 #endif
	/*
	NetWinder Floating Point Emulator
	(c) Rebel.com, 1998-1999
	(c) Philip Blundell, 1998

	Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include "fpa11.h"
	#include "softfloat.h"
	#include "fpopcode.h"
	#include "fpmodule.h"
	#include "fpmodule.inl"

	#include <asm/uaccess.h>

	static inline
	void loadSingle(const unsigned int Fn,const unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	fpa11->fType[Fn] = typeSingle;
	get_user(fpa11->fpreg[Fn].fSingle, pMem);
	}

	static inline
	void loadDouble(const unsigned int Fn,const unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	unsigned int *p;
	p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
	fpa11->fType[Fn] = typeDouble;
	get_user(p[0], &pMem[1]);
	get_user(p[1], &pMem[0]); /* sign & exponent */
	}

	static inline
	void loadExtended(const unsigned int Fn,const unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	unsigned int *p;
	p = (unsigned int*)&fpa11->fpreg[Fn].fExtended;
	fpa11->fType[Fn] = typeExtended;
	get_user(p[0], &pMem[0]); /* sign & exponent */
	get_user(p[1], &pMem[2]); /* ls bits */
	get_user(p[2], &pMem[1]); /* ms bits */
	}

	static inline
	void loadMultiple(const unsigned int Fn,const unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	register unsigned int *p;
	unsigned long x;

	p = (unsigned int*)&(fpa11->fpreg[Fn]);
	get_user(x, &pMem[0]);
	fpa11->fType[Fn] = (x >> 14) & 0x00000003;

	switch (fpa11->fType[Fn])
	{
	case typeSingle:
	case typeDouble:
	{
	get_user(p[0], &pMem[2]); /* Single */
	get_user(p[1], &pMem[1]); /* double msw */
	p[2] = 0; /* empty */
	}
	break;

	case typeExtended:
	{
	get_user(p[1], &pMem[2]);
	get_user(p[2], &pMem[1]); /* msw */
	p[0] = (x & 0x80003fff);
	}
	break;
	}
	}

	static inline
	void storeSingle(const unsigned int Fn,unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union
	{
	float32 f;
	unsigned int i[1];
	} val;

	switch (fpa11->fType[Fn])
	{
	case typeDouble:
	val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
	break;

	case typeExtended:
	val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
	break;

	default: val.f = fpa11->fpreg[Fn].fSingle;
	}

	put_user(val.i[0], pMem);
	}

	static inline
	void storeDouble(const unsigned int Fn,unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union
	{
	float64 f;
	unsigned int i[2];
	} val;

	switch (fpa11->fType[Fn])
	{
	case typeSingle:
	val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
	break;

	case typeExtended:
	val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
	break;

	default: val.f = fpa11->fpreg[Fn].fDouble;
	}

	put_user(val.i[1], &pMem[0]); /* msw */
	put_user(val.i[0], &pMem[1]); /* lsw */
	}

	static inline
	void storeExtended(const unsigned int Fn,unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union
	{
	floatx80 f;
	unsigned int i[3];
	} val;

	switch (fpa11->fType[Fn])
	{
	case typeSingle:
	val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
	break;

	case typeDouble:
	val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
	break;

	default: val.f = fpa11->fpreg[Fn].fExtended;
	}

	put_user(val.i[0], &pMem[0]); /* sign & exp */
	put_user(val.i[1], &pMem[2]);
	put_user(val.i[2], &pMem[1]); /* msw */
	}

	static inline
	void storeMultiple(const unsigned int Fn,unsigned int *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	register unsigned int nType, *p;

	p = (unsigned int*)&(fpa11->fpreg[Fn]);
	nType = fpa11->fType[Fn];

	switch (nType)
	{
	case typeSingle:
	case typeDouble:
	{
	put_user(p[0], &pMem[2]); /* single */
	put_user(p[1], &pMem[1]); /* double msw */
	put_user(nType << 14, &pMem[0]);
	}
	break;

	case typeExtended:
	{
	put_user(p[2], &pMem[1]); /* msw */
	put_user(p[1], &pMem[2]);
	put_user((p[0] & 0x80003fff) \| (nType << 14), &pMem[0]);
	}
	break;
	}
	}

	unsigned int PerformLDF(const unsigned int opcode)
	{
	unsigned int pBase, pAddress, *pFinal, nRc = 1,
	write_back = WRITE_BACK(opcode);

	//printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));

	pBase = (unsigned int*)readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode))
	{
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

	switch (opcode & MASK_TRANSFER_LENGTH)
	{
	case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break;
	case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break;
	case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
	default: nRc = 0;
	}

	if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
	return nRc;
	}

	unsigned int PerformSTF(const unsigned int opcode)
	{
	unsigned int pBase, pAddress, *pFinal, nRc = 1,
	write_back = WRITE_BACK(opcode);

	//printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
	SetRoundingMode(ROUND_TO_NEAREST);

	pBase = (unsigned int*)readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode))
	{
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

	switch (opcode & MASK_TRANSFER_LENGTH)
	{
	case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break;
	case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break;
	case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
	default: nRc = 0;
	}

	if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
	return nRc;
	}

	unsigned int PerformLFM(const unsigned int opcode)
	{
	unsigned int i, Fd, pBase, pAddress, *pFinal,
	write_back = WRITE_BACK(opcode);

	pBase = (unsigned int*)readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode))
	{
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

	Fd = getFd(opcode);
	for (i=getRegisterCount(opcode);i>0;i--)
	{
	loadMultiple(Fd,pAddress);
	pAddress += 3; Fd++;
	if (Fd == 8) Fd = 0;
	}

	if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
	return 1;
	}

	unsigned int PerformSFM(const unsigned int opcode)
	{
	unsigned int i, Fd, pBase, pAddress, *pFinal,
	write_back = WRITE_BACK(opcode);

	pBase = (unsigned int*)readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode))
	{
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;

	Fd = getFd(opcode);
	for (i=getRegisterCount(opcode);i>0;i--)
	{
	storeMultiple(Fd,pAddress);
	pAddress += 3; Fd++;
	if (Fd == 8) Fd = 0;
	}

	if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
	return 1;
	}

	#if 1
	unsigned int EmulateCPDT(const unsigned int opcode)
	{
	unsigned int nRc = 0;

	//printk("EmulateCPDT(0x%08x)\n",opcode);

	if (LDF_OP(opcode))
	{
	nRc = PerformLDF(opcode);
	}
	else if (LFM_OP(opcode))
	{
	nRc = PerformLFM(opcode);
	}
	else if (STF_OP(opcode))
	{
	nRc = PerformSTF(opcode);
	}
	else if (SFM_OP(opcode))
	{
	nRc = PerformSFM(opcode);
	}
	else
	{
	nRc = 0;
	}

	return nRc;
	}
	#endif